This is a really stange survey. You ask if the tag for a “park” is correct or not by pointing some examples in OSM. But you don’t show any aerial or on the ground pictures. Then only the local mappers can answer to your questions or we have to switch to another project just to find a possible answer. Next time, insert pictures or hi-res aerials in you survey !

Once you’ve been through all the introduction, in the right pane, (Interactive Map), click the + (plus) symbol which will bring up buttons to allow switching the base layer between OpenStreetMap and Bing Aerial.